Philips HF3430 Mode D'emploi page 25

ENGLISH
25
For transmitters rated at a maximum output power not listed above,
the recommended separation distanced in meters (m) can be estimated
using the equation applicable to the frequency of the transmitter, where P
is the maximum output power rating of the transmitter in watts (W)
according to the transmitter manufacturer.
Note: These guidelines may not apply in all situations. Electromagnetic
propagation is affected by absorption and reflection from structures,
objects, and people.